The rain is coming back.
Only, it's not coming back with a little sprinkle here and there. It's coming back with a bit of a vengeance, enough that the record for daily rainfall on July 23 is understandably nervous.
Showers have already dotted the region today and a few will be roaming around tonight. But as a strong (especially for July) area of low pressure moves ashore, a large batch of moderate-to-heavy rain is expected to swirl into the Puget Sound region from the south, starting right about the time of the morning commute and lasting non-stop pretty much through the evening.
There is a chance that we could see a few thunderstorms amidst the downpours as well, especially Wednesday afternoon and evening.
Rainfall this time of year is fairly rare as the last week of July and first week of August are the statistical driest times of the year in Western Washington. In Seattle, it's only rained on July 23rd 13 times in the past 121 years.
So any rain on the date is unusual, but we have a chance to really make a mark in the Seattle weather record books this year. Forecast models have painted anywhere from 0.50"-1.50" of rain in the lowlands (with later models issued Tuesday morning leaning toward the heavier amounts).
The daily rainfall record for July 23 in Seattle is 0.54" set way back in 1949. But what's really a sign of how rare heavy rainfall is this time of year, the second-wettest July 23rd is just 0.06 inches.
Flash flooding concerns for Eastern Washington
Some much-needed rain will also fall in the mountains and in the fire-ravaged areas of northern Eastern Washington, but it may actually be too much of a good thing.
A Flash Flood Watch has been issued for the eastern slopes of the North Cascades, which includes much of Chelan County and western Okanoagan County and the towns of Wenatchee, Chelan, Leavenworth, Omak and Winthrop. Of particular concern are potential mud flows in the areas scarred by wildfires over the past two years, including the ones currently burning this summer.
The rains there may also come with lightning and strong winds.
Rain will decrease Wednesday night and after some showers linger into midday Thursday, we quickly dry out and warm up again with a return to sunny and warm-to-hot conditions this weekend into early next week.